Furnace.



A. W. MOYER.

FURNACE.

APPLlcATaoN FILED DEC. a. 1915.

1,202,303. Patent-ed 0@t.24,1916

nains-sniff l.

FIGI

TURA/EY A. W. MUYEH.

FUHNACE.

APPLlcmoN FILED Dic. 3. 1915.

Patented Oct.. 24, 1916.

4 SHEETS-SHEET 2.

Wl TNESSES: IN1/EN TUR A. W. MOYEH.

FURNACE.

APPucArroN FILED nic. s. |915.

Patented Oct. 24, 1916.

4 SHEETSSHEET 3.

ALBERT W. MOYER, 0F NEW YORK,` N. Y.

FURNACE.

Specification of Letters Patent.

Patented Oct. 24, 1916.

Application filed December 3, 1915. Serial No. 64,814.

To allwlwm z't may concern:

Be it known that I, ALBERT lV. Moyen, a citizen of the United States ofAmerica, residing at New York city, New York, have invented a new anduseful Furnace, of which the following is a specification.

My present invention relates particularly to heat treating furnaces forannealing, hardening. tempering and otherwise heat treating differentarticles.

A special object of my inventi.. is to secure substantially uniform andeven heating of relatively large and bulky objects.

)ther objects are to conserve and prevent loss or waste of heat and toeffectively control the heat.

These objects I have attained by constructing my furnace with a heatingcha1nber, a combustion chamber above the heating chamber and separatedfrom the heating chamber by a substantially horizontal imperforate wall,and by conducting the heat from the combustion chamber downwardly aroundthe separating wall and into the heating chamber beneath saidimperforate wall.; The Waste heat is led off from the heating chamberthrough exhaust flues and the iiow of heat through the heating chamberis so governed as to produce practically uniform heating effectthroughout the chamber'. In a preferred construction the heat conductingfines open into the heating chamber at different elevations, and theflues are proportioned in Size according to their distance from thesource of heat. The heat is preferably supplied by burners discharginginto the opposite sides of the combustion chamber, and the various finesare preferably formed as passages in the side walls of the furnace body.

Various other features and the details of construction, will appear asthe specification proceeds.

ln the accompanying drawings, I have illustrated my invention embodiedin a preferred form and in a slightly modified form, but it will beunderstood that other changes and modifications may be made Withoutdeparting from the truespirit and scope of the invention.

In the drawings: Figure 1 is ii. transverse sectional view of a car typeor movable hearth furnace embodying myinvention. Fig. 2 is alongitudinal sectional view of the same. Fig. 3 is a transversesectional view similar to Fig. 1 of a slightly modified form of theinvention. Fig. 4 is a longitudinal sectional view of the second form. i

In. the illustration, the combustion charliher is designated 7, and theheating or treating chamber is designated chamber-,being located abovethe heating chamber and separated therefrom by a substantiall yhorizontally disposed imperforate wall l). The furnace is usuallyconstructed with side walls 10 connected at the top by a top wall 1l,which forms the roof to the combustion chamber, and the imperforatechamber defining wall 9 is preferably in the form of an arch connectingthe two side walls, as indicated. The heating chamber is made relativelyhigh to accommodate tall or bulky pieces of work, such as boxes ofarticles to be annealed. sheet metal, and the like. The heat ispreferably supplied by gas or oil burners, such as those indicated at15. discharging in through openings 16 in the side walls into oppositesides of the combustion chamber. The heat products are conducted fromthe. combustion chamber around thel iniperforate separating wall and.into the heating chamber by fines consisting in the illustration, ofvertical passages 17 formed in the side walls communicating at theirupper ends by lateral passages 18 with the combustion chamber, and atthe lower ends by lateral passages 1D with the heating chamber. In thefirst form of the invention illustrated, a. plurality of these branchpassages lil-opening into the heating chamber are provided for eachvertical heat conducting flue 17, and the cross sectional area of thebranch passages is proportioned according' to the distance of suchpassages from the source of heat. Thus, as illustrated. the branchpassage 19 nearest the con'ibnstion chamber is made relatively small,and the passares farther away are made gradually larger. In this way a.substantially uniform How of heat through the several passages .isassured. The heat is preferably introduced into the heating chamber atboth sides thereof, thc inlet passages at the opposite sides beingpreferably arranged in alternating relation, as indicated in Fig. 1,where the black arrows indicate the ilov of heat entering at the left,and the dotted line arrows indicate the heat entering .from the inletsatt the right, which, as indicated by the dotted lines, lie iu,` a planebeyond that of the inlets at the left. Where, as in the illustration,burners are 8, the combustion provided discharging into the oppositesides of the combustion chamber, the burners at opposite sides areoffset from each other so that the iow of one burner will not oppose thefiow of the burner at the opposite side, and furthermore, the entrances18 to the heat conducting filles 17, are preferably cach locatedsubstantially opposite the burner at the opposite side, as shown inFig. 1. Baflles 20 are. preferably provided opposite the burner openingsto break up the blast from thd burner, thereby insuring propercombustion, and to deflect the flame somewhat so as to revent itspassage straight across the combustion chamber and out before combustioncan take place. From the heating chamber the waste products are led offthrough exit or outlet fines consisting in the present disclosure ofdownwardly extending passages 22 formed in the side walls communicatingat the bottom with outlet conduits 23 leading to a stack 24 at the backof the furnace. In the form of the invention illustrated in Figsl 1v and2, these outlet iues extend from the bottom of the heating chamber,communicating with the lower portion of the heating chamber by lateralpassages 25.

In the form of my invention illustrated in Figs. 3 and 4, instead ofentering the heat into the heating chamber at different levels, the heatis all entered at the bottom of the chamber, and passes out of thechamber through exits provided in the top of the chamber. Here thedownwardly extending heat conducting passages 17 each hav'e an outlet 19opening into the bottom portion of the heating chamber, and the wasteproducts escape from the upper portion of the heating chamber throughoutlets 27 opening into downwardly extending flues 22 leading to theoutlet conduits 23. This construction also forces the heat to traversethc entire heating chamber so as to heat it substantially uniformlythroughout, and the Crossfire of infiowing heat streams, as indicated bythe arrows, prevents the formation of any pockets or dead areas.

The degree of heat is governed by means of the burners, and valves maybe provided for controlling the flow of heat. Thus, in the illustrationvalves are shown at 30 for controlling flow through the exit flues. Afurther control may be exercised by means of a relief damper 31 in theexhaust stack 24. Opening this check damper reduces the draw of thestack on the outlet flues and so checks the outflow of the heatproducts.

To prevent loss of 'heat by radiation, the furnace Walls are preferablycovered with an external layer 33 of thermal insulating material. I findporous insulating brick to be an excellent material for this purpose.

The furnaces illustrated are of the carbottom type, but it will be clearthat the invention is equally well adapted to a furnace of thestationary hearth type. The hearth, which in this case is in the form ofa platform mounted on a car truck is designated 35, and the car truckwhich mounts it is designated 36.

The furnaces shown are of single ended construction, having a door B8only at om end, the opposite end being in the form of solid wall 39. Toprevent loss of heai around the edges of the door I preferably provide aseal in the form of a rearwardly extending down-turned flange 40 on theupper edge of the door which dips into a sealing groove 41 on the frontof the furnace over the door-way therein, and a dependent ange 42 on thelower edge of the door engaglng in a sealing pocket provided by thechannel or angle iron 43 on the outer end Aof the car. These sealinggrooves or channels support a suitable sealing medium, such as sand orthe like. In the car-bottom type of furnace the edges of the car-bottomare preferably sealed by providing sealing channels 44 along the sidesof the car into which flanges 45 at the sides of the furnace dip, and asealing channel 46 on the forward or innermost end of the car over whichengages a shelf 47 on the rear Wall 39 of the furnace.

From the foregoing it will be seen that the exceptional height given tothe heating chamber adapts the furnace to the treatment of relativelytall and large objects, and the distribution of the heat through theheating chamber in the manner illustrated, produces a substantially evenheating throughout such objects. The imperforate division wall betweenthe combustion chamber and heating chamber in addition to its separatingfunction, performs the additional function of transmitting heat to theheating chamber by radiation.

lVhat I claim is:

1.4 An over fired heat treating furnace comprising a furnace body havingside walls connected by a top wall, a substantially horizontalimperforate wall extending across between the side walls and separatingthe in terior of the furnace body into an upper combustion chamber and alower heating chamber, heat conducting flues extending from thecombustion chamber down through one of the sido Walls and into theheating chamber beneath tbc impor-forato separating wall. exit (luesleading out from the heating chamber for carrying away the wasteproducts, and a burner discharging into the combustion chamber.

t2. An over fired heat treating furnace comprising a furnace body havingside walls connected by a top wall, a substantially horizontalimperforate wall extending across between said side walls and separatingthe interior of the furnace 4st'fintially horizontal iinpeifoi'zite willbelow the iinpiirfoi'nti: scpnmting wnlh sind side walls l'intlifihaving exit passages formell therein nimmiinicziliing with thehuntingchiiniliiei'.

3. An ovvi' l'iiizl lient` comprising ai fiiinnic hmly bring :ilimiting; cliziinheriinrl :i nennhnstion chamber :ibnvu sniil limitingizhiiinhi', :i substantially li ii- Zonta! iiiiiiifil'nrzillii wzillseparating iin' henting chamber from the umnhnstion cliziznbm'` :iburner ilinvhsirg'ing into the ifinnliiisliiin chamber Anil lientconducting liicgav in mmniiiniirzitimi with tlm rfmnbiinliiin chiinibvruxtiiniling Into thv. lil-:icing ulniinher lil, points beneath thu`iiiiiiarl'in'nm svpni'ziiinsj will, Sziiil lines \':ii' Vin, n iii cross.Lseiztiiiniil :iiiii sirifnriling tu thel illsfnnw :iiiny 'Flinn liiMuir-:riol lient lo tlnfiiby equalize the: limi." if liirni into the4ilillei'ii'nt portions; 0l liln"v healing chamber.

4. In Conibiiniliiin, ii furniifa bnilj: lniifnif :i heating Lhriinlinrtherein nini ii `Jainihiirf'iimi i-liainbor ahorn Said heating.:Chamber, ai Sinh- Sepiv rating the limiting Chamber from thecrinibiistion nhziinher, ai, burner discharging into one side of theComblislion Chzimlivr, a limit conducting line extending finm theopposite, side of the cmnhiistion clinmhiii' siihslmitiii lly oppositethe point (if discharge of the hinni' into the uhznnlier, Said heiztcnnilinrting llinixtending downwardly anfl inn thi heur 'Mig chamberbelow the!iinperlm'ne sqnirfilf ing Wall, and nn outlet llueixliinilingr f inin the heating chamber in :i pluim siiliiiinrilinllyeating 'Furnace apposite 'thu plinio of iinti'y of the lient m-'diluting fluff thereinlo.

5. In cmnbinfition` zi iciirnnrzvy bofly having :i heating ihnniherthm-0in :incl :i combustion wlnnnhier :ihin'n siiil limitingr chamber, dsilhslnntizilly hiirimntzil iinpnrfornte wnll 50pm milling the` huntingclianihir funn thv, rombiisiiiiin chain'ibrn, n liiii'nei' dischargingintr the Cmnlnistirin iflniinbfri", ai heut. conrliivl'irig lliii:00mmiinimlingr :it its upper unil with thv` minlnlSliun vhnmher undextending ilnwn iif'fiiwlly hiilmv the impeifm'zite Separating wzill,Hniil liiii having :i plurality of' inlits mening :il ilillerinl` levelsinto the limiting ilmn'iboi' liehiw the iinperfiirzito wnll. the inhilisnl lh@ higher lvvels; living smaller than thi'ise :it the lower levelsto thorcliy substrinlhilly eifiinlizi, the flow nl limit into thelimiting clninilwr ,inil exit Hilos leziiling nfl' fiiini tbl: limitingchuinbir.

il, xi Ti min' firiwl honi', fruiting finiiiicf: 'minimising :i`l'innziiilinily hniing :i rehiiiii'frlv high inentingr ilimnlier loreceive mill ibjrinj find :i rinnbiistiiiin Cinnnhcr :ilini'u midlimiting clnin'ilior, liiii'niI-S discharging intr the iifiinhiistimiulizimliiii, n Snhtiintizilly liiiriziiiitzil iinpurfinzite willsilliaiisili'iig the healing' irliiiii'ibiri from (he i'iiniliiigtionrliarnlivr, :mil inni-filling limit tu Tho upper prirtions nl uhjiff't'sin the limiting Chzimhnr wlifilly hy riiiliiiliion, hea@ conductingfines extending fifnn lli@ icon'ibiisticm chamber :irniiiifl theiini'wrfni'ziti, Separating wall sind intr; ihn limiting` (-liiimbcrbeneath Siiiil wiill, :mil 0xff` lines extending funn planes in thehvnliniij illirinihiw niilistniil'izilly oppositie thu whims nl vnlijynl' thiI l uit cnniliicting lilies lilimi-inlri lli Lherilliy unipol :iflow 01' lient lhrmiglniiil ther hauling' i'lniinbm,

A L l i ERT XV. M YER.

